System or method of concrete fireproofinc of structural steel



F. P. KAFKA.

SYSTEM OR METHOD OF CONCRETE FIR'EPROOFING OF STRUCTURAL STEEL.

APPLICATION FILED NOV-9.1918.

1 ,306,701 Patented June 17, 1919.

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F. P. KAFKA.

SYSTEM 08 METHOD OF CONCRETE FIREPROOFING OF STRUCTURAL STEEL.APPLICATION FILED NOV. 9. 1918.

1,306,701 I Patented June 17, 1919.

2.5HEET5-SHEET 2. L? 4 v M ATTORNEYS UNITED STATES PATENT OFFICE. I

FREDERICK P. KAFKA, OF NEW ROCHELLE, YORK.

SYSTEM OR METHOD OF CONCRETE-FIREPROOFING OF STRUCTURAL Specification ofLettersPatent. Patented J 3 1'7 1919;

Original application filed May 25, 1918, Serial No. 236,445. Divided andthis application filed November 9,

1918. Serial No. 261,778.

T 0 alt whom it may concern:

Be it known that I, Fnnnnnron P. KAFKA, a citizen of the United Statesof America, and

resident of New Rochelle, in the countyof Westchester and State of NewYork, have invented certain new. and useful Improvements in Systems orMethods of Concrete Fireproofing of Structural Steel, of which thefollowing is a specification.

My invention relates to a method, or sys tem of means, by whichstructural steelwork is incased in concrete, reinforced or otherwise,for the purpose of fire protection and such additional stability as maybe de-' rived from the inherent characteristics of the means employed,and, particularly, relates to the method, or system of means, by whichcolumns, pillars, or other similar vertical structures are reinforced,strengthened, and fireproofed, including means for supporting forms ormolds so as to enable the production of a homogeneous structure of greatstrength, durability, and many other desirable characteristics, incombination with the adjacent or cooperating girders and beams offabricated structures, such as set forth in my pending applicationSerial No. 236,445, filed May 25, 1918, of which this application is adlvision.

' It should be understood that, while the columns, pillars, or othervertical members,

constructed in accordance with my invention, may be in, and form a partof, fabricated structures of all kinds and incorporated in the latter incombination with floors, ceilings, walls, and horizontal girders andbeams, my present invention is to be taken in the broader sense and tocomprehend stanchions, uprights, columns and pillars made independentlyof fabricated structures, when and as desired. ,In order that myinvention may be clearly understood, I have provided drawings wherein:

Figure 1 is a view showing, in section and plan, part of the layout of afabricated structure, I including horizontal girders, beams, and apillar or column embodying my invention;

Fig. 2 is a horizontal section of column or pillar beams, together withthe means emp v V I Ting through the apertures 5 1n thej 'arms2 of theform-members, the angular ends of the 'ployed by me to build up aconcrete form about the same' Fig. 3 is'a side elevation of thestructure shown in Fig. 2;

Fig. 4 is a detail, in perspective, of a memthe constructionof a column,etc.; 7

Fig. 5 1s a detail in perspective of a'clip employed to unite thesidewalls of'the form;

adapted to hold the side Walls to members; and

F1g. 7 is a perspective View of a clip the corner adapted to join'theelements of the member right member which is to be reinforced, or f isto become a part of a fabricated struc' ture, in accordance with themethod, or system of means, of my invention. These members may have anyform desired; but, for

example, are herein illustrated as U-shaped in cross-section, and areshown as spaced apart and arranged in parallelism with theirlongitudinal side flanges extending in opposite directions. A pluralityof form-members are grouped about the column members 1, each consistingof two elements and the latter each having a long arm 2, an arm 3 bentat a right-angle thereto, and an arm a bent at a right-angle to the arm3, and in' parallelism with the arm 2. The long arm 2 is provided withan aperture 5. V A pair of these elements are linked together by meansof the clip 6, shown'in Fig. 7 ,said

clip having its arm 7 bent over. upon the" overlapping arms 2. By thuscombining the elementsof the form-members they may be made of any lengthdesired, within the lim- I itations of the arms 2,.andapplied'at'opposite sides of the column members 1. shown in Fig. 1, theform-members maybe made all in one piece, as indicated at 8, if desired.7 By making them in two pieces, as shown, adjustments can be made toanswer practically any requirement of the column structure. Two such;form-member's, as shown incFigs. 1 to-4c, are applied to the columnmembers 1, with side columnmembers 9 interposed between theml, .the samebeing secured together by tie-wires or bars 10 passform members beingout-turned, as shown in 60 Fig. 6 is a perspective view of a clip pliedto the column members 1, in any de sired number and relation, become afoundation upon which to build the ultimate form for the concretefilling. Four corner angleirons, or angular members 11 of suitablematerial, are then applied to the angular ends of the form1nembers, asshown in Figs. 2 and 3, said angular members being of any desiredlength, and of suflicient dimensions to embrace the angular ends of theformmembers, the same being held in position at the four corners of thestructure by encirclin binding Wires. The structure is now in conditionto receive the first tier or layer of wall or form boards 12, which areapplied as shown in Figs. 2 and 3, one on each flat side of the formstructure, against the angle-irons or members 11, and spanning the spacebetween the same, the arrangement being such that the end of each boardabuts the body of an adjacent board and overlaps the edge or end ofanother board. I prefer to secure the form boards to the angle-irons by.means of clips 13, such as illustrated in Fig. 6, the same being appliedso as to cause its arms to embrace one side of an angleiron and a partof the form board adjacent the edge thereof, which overlies said side ofthe angle-iron, as clearly shown in Fig. 3. Thus the form boards aretemporarily secured to the angle-irons in proper position. The next tierof form boards is built up by applying a pair of clips 14, such as shownin Fig. 5, to the upper edge of the form boards, by setting said clipsover said edge with the parallel legs 15 downwardly and the threeparallel legs 16 upwardly. Thus, the sets of three parallel legs of theclips are in position to receive the form boards of the second tiers,the-lower edges of which are entered between the parallel legs. Anotherpair of clips 1 1 is then set uponthe upper edge of each of the formboards, L s shown, until the entirecolumn issurroundedby form boardsheld in place by the clips 13 and clips 14:. Y

In practice, Lprefer that the form'boards shall be ofuniform sizesuitable for the purpose; but, a large latitude in the size is possibleand permissible, as shown in Figs. 1 and 2. .Also, I prefer, inpractice, to employ form boards composed of what is known asfiber-board. This board is made very thinand has a remarkable degree ofstrength. It may be cut to any desired size suitable for thewvorlr orwithin the limitations of the capacity of the frames and forms; but, ofcourse, itwill be understood that I may use sheets of metal, iidesired.A desirable feature, however, is'that the form boards, whether of fiberor metal, shall be cut of uniform size suitable f f orthe purposesindicated. It is within the scope of my invention to adjust the formboards on the ground andelevate the same toa posh tion adjacent thecolumn forms; but, I find that it is a more convenient practice to buildup the form members on the column members as described and then applythe form boards.

lVith the forms thus built, the cement o concrete substance is pouredinto the mold or form, and between the column members in all the openspaces, after which it is allowed to set or solidify.

To knock down or disassemble the form, the clips 13 are first knockedout or removed. The boards are then successively removed,

which, of course, means the removal of the clips 14. When all the boardsare removed, the angle-irons or corner braces 11 are separated from theconcrete, which is quite readily accomplished. The form members of Fig.4, however, are allowed to remain embedded in the solidified structureand arelost in each operation. I

.In F ig. 1, I have shown my invention appliedto a column, pillar orstanchion surrounded by other elements of a fabricated structure builtup in accordance with my invention considering the same from anotheraspect; that is tosay, that aspect of my invention disclosed in myaforesaid application, #236,4A5. In this figure, I have shown thegirders 17 of a fabricated structure, such as a building, at oppositesides of the column form and abutting agains'tthe side spanningmen'lbers9, also, beams 18 having their endsabutting against the walls of thecolumn members or beams. Thewall boards '19 of the forms do not extend'from angle-piece to angle-piece 11, but are made to extend only to theform boards 20, which are held together by a clip 21 and to floorboard-supporting beams 22, thela'tter being supported by mortise-d sillbeams 23. Base boards 21 underlie thebeams 18 and the whole structure issupported by a plurality Ofloo ped and tied supporting wires 25, all asset forth in my aforesaid application.

'Floor boards 26 overlie the entire structure thus described, thusconstituting-a support and mold for the concrete formingthefioor andreinforce for the beams. The same structure is applied to the girders17, and, when the columns are entirely surrounded as described, theforms are ready to have the cement poured therein, in order to produce ahomogeneous mass constituting the floors and columns of a fabricatedstructure. According to the form and size of the columns and the natureofthe fabricated structure in which they are incorporated, the size andform of the wall boards 19and 27 willbe determined.

Having thus described-my invention, what I claim and *desire to secureby Letters ".Pa'tent is: V

1. In a sys-tem'for concretefireproof construction, wherein verticalstructural pillars are incased in concrete, the following elements incombination to constitute a mold or form: a metal form bent at each endto produce angular members both in one and the same plane and on thesame side of the form, the remaining section of the form being of alength equal to the Width of the pillar, two or more of these formsbeing secured on opposite sides of the pillar with the angular membersin a horizontal plane and equi-disthe board forming the upper section,where-- by the form is built up and ready to be filled with concrete,all of the elements being capable of being liberated when the concretesets, except the angular form members Which remain embedded in theconcrete.

2. In a system for concrete fireproof construction, wherein verticalillars are incased in concrete, the following elements in combination toconstitute a mold or form:

a plurality of strips of metal bent at each end to produce rectangularforms, both of said forms projected on one and the same side of the striand in; the same plane, the remaining straight section of the strip.being of a length equal to the width of the column to which they are tobe applied; a plurality of these strips being secured to opposite sidesof the column with the angle sections disposed in a horizontal plane andequi-distant from the columns; angle-irons of right angular cross-section secured to said angular forms to produce the vertical cornersof the column form; suitable boards placed against the outer faces ofsaid angleirons and secured thereto, and so the form is built up tier bytier.

3. In a system for concrete fireproof construction, wherein Verticalpillars are incased in concrete, the following elements in combinationto constitute a mold or form: a plurality of rods or strips of metalbent at each end to produce rectangular forms, both of said formsprojecting on one and the same side of the rod and in the same plane,the remaining straight section of the strips being of a length equal tothe width of the column to which they are to be applied, a plurality ofthese strips being secured to opposite sides of the column with theanglesections disposed in a horizontal plane and equi-distant from thecolumns; angle-irons of right-angular cross-section secured to saidangular forms to produce the vertical corners of the column;fiber-boards of predetermined dimensions secured to the outer faces ofthe right-angular sections to make the first tier of the form; cleatshaving oppositely disposed bifurcated termini adapted to fit over theupper edge of said fiberboards and so spaced asto form slots to receivethe second tier of fiber-boards; with means to secure said boards to theangleirons, and so the form is built up and ready to be filled with theplastic material, and.

when the concrete is set all of the elements above named are liberatedexcept the rods and right-angular forms which remain em bedded in theconcrete.

4. In a. system for incasing vertical pillars in concrete for purposesof fire protection and reinforcement a plurality of right angular formsadapted to be mounted at the corners of a rectangular pillar with meansto secure said forms to the pillar, and form boards adapted to cooperatewith saidright' angular forms to form a mold about the pillar, and meansto secure said boards to said angle forms.

5. In a system for incasing vertical pillars in .concrete for purposesof fire protection and reinforcement a plurality ofright angular formsadapted to be mounted at the corners of a rectangular pillar with meansto secure said forms to the pillar, and angle irons adapted to besupported by said angle forms to form the corners of the mold and meansto secure said angle irons. to said B. A. MINNIQH, ROB. N. CARRICK.

Copies of this patent niay be obtained for five cents each, byaddressing the "Commissioner of Patents,

' Washington, D. G. a

